The Arrowverse ran five shows on one continuity with a crossover event every season

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The Arrowverse Crisis crossovers took a year of planning to deliver four hours of television One Chicago's annual crossover nights: gimmick or the best event TV network television still has? Dick Wolf built a shared universe out of Chicago shows sharing cases and characters — syndication logic at scale American Horror Story seasons sharing one universe: clever continuity or confusing mess Star Trek's modern shows share one timeline and it mostly works until the continuity homework piles up A TV shared universe demands synchronized production schedules that every writers' room hates Marvel's two attempts at TV shared universes — the Agents of SHIELD era vs the Disney+ era — taught opposite lessons Shared universes reward completists and punish casual viewers — is that a bug or the whole point? A crossover needs a threat big enough to justify two casts sharing a screen When the tone clashes — a comedy lead dropped into a grim procedural — the crossover breaks both shows